Convert point to latitude and longitude

[HosseinBabriani]

Hi i need latitude and longitude inside getTileUrl function but I can't usemap.unproject or crs.pointToLatLng but result isn't real result.
Is there any way to solve my problem ?

[moovida]

@hossein-hbb not sure I understand. You can't use the mapstate functions because you do not have access to it? And therefore you need a conversion between the TMS tileschema and lat/long?

[HosseinBabriani]

I try to modify plugin and add my custom parameters in plugin like this:
'lat':lat.toString(),
'lng':lng.toString(),

[HosseinBabriani]

But when I use pointToLatLng or usemap.unproject return wrong values for lat and lng...

[HosseinBabriani]

I need change methode like this :

 String getTileUrl(Coords coords, TileLayerOptions options,LatLng latLng) {
    var data = <String, String>{
      'x': coords.x.round().toString(),
      'y': coords.y.round().toString(),
      'z': coords.z.round().toString(),
      'lat':latLng.latitude.toString(),
      'lng':latLng.longitude.toString(),
      's': getSubdomain(coords, options)
    };
    if (options.tms) {
      data['y'] = invertY(coords.y.round(), coords.z.round()).toString();
    }
    var allOpts = Map<String, String>.from(data)
      ..addAll(options.additionalOptions);
    return util.template(options.urlTemplate, allOpts);
  }

[moovida]

It might be you are missing some pieces in the conversion.
Here some code I use to convert a screen position to latlong.

var p = e.localPosition;
var pixelBounds = map.getLastPixelBounds();

CustomPoint pixelOrigin = map.getPixelOrigin();
var ll = map.unproject(CustomPoint(pixelOrigin.x + p.dx, pixelOrigin.y + p.dy));

As you can see you need to consider the pixelOrigin also. Might that be your problem?

[HosseinBabriani]

Can you explain e.localPosition .
how can I access or create e?

[moovida]

In my case I had an event from a GestureDetector. That part will not be of use for you, since you are converting tiles positions. I wanted to show you more the pixelOrigin part.

I am starting to have the feeling that you just need to convert the tile position index to lat/long?
If that is so, you can just use the following methods:

  static double tile2lon(int x, int z) {
    return x / pow(2.0, z) * 360.0 - 180.0;
  }

  static double tile2lat(int y, int z) {
    double n = pi - (2.0 * pi * y) / pow(2.0, z);
    return radianToDeg(atan(sinh(n)));
  }

Rationale behind it is found here: https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames

[HosseinBabriani]

Its work but when _createTileWidget all tiles positions is wrong...

my code :

  static double tile2lon(int x, int z) {
    return x / pow(2.0, z) * 360.0 - 180.0;
  }

  static double tile2lat(int y, int z) {
    var n = pi - (2.0 * pi * y) / pow(2.0, z);
    return radianToDeg(atan(numerics.sinh(n)));
  }

  String getTileUrl(Coords coords, TileLayerOptions options) {
    var data = <String, String>{
      'x': coords.x.round().toString(),
      'y': coords.y.round().toString(),
      'z': coords.z.round().toString(),
      'lat':tile2lat(coords.y.round(),coords.z.round()).toString(),
      'lng':tile2lon(coords.x.round(),coords.z.round()).toString(),
      's': getSubdomain(coords, options)
    };
    if (options.tms) {
      data['y'] = invertY(coords.y.round(), coords.z.round()).toString();
    }
    var allOpts = Map<String, String>.from(data)
      ..addAll(options.additionalOptions);
    return util.template(options.urlTemplate, allOpts);
  }

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